2022 Fiscal Year Annual Research Report
Dynamic resonant frequency ratio control for high-power piezoelectric devices
| Project/Area Number |
22J11769
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| Allocation Type | Single-year Grants |
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| Research Institution | The University of Tokyo |
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Principal Investigator |
王 方一 東京大学, 工学系研究科, 特別研究員(DC2)
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| Project Period (FY) |
2022-04-22 – 2024-03-31
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| Keywords | 圧電 / 共振周波数 |
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| Outline of Annual Research Achievements |
Based on the proposed resonant frequency ratio control method, we have improved the high-frequency AC switch short-circuit and designed a multimodal Langevin ultrasonic transducer with a passive piezoelectric ceramic piece.
By controlling the resonant frequency ratio, the two longitudinal vibration modes of the transducer can be dynamically matched, and stable dual-frequency ultrasound can be produced, which is of great help for exploring new applications in acoustics such as acoustic levitation and ultrasonic cavitation.
Furthermore, precise driving is achieved by adjusting the output quasi-sawtooth wave displacement of the two modes. By dynamic resonant frequency control, the prototype piezoelectric actuator achieves stable output under long-term operation.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Through improvement, the resonant frequency ratio control method is applicable to high-power ultrasonic devices.
Stable output of dual-frequency ultrasound is realized.
Long-term dynamic frequency ratio compensation of multimode piezoelectric actuators is realized.
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| Strategy for Future Research Activity |
Based on the above results, our next research focus will be on exploring new principles and applications of dual-frequency ultrasound. We plan to use numerical analysis to obtain information on the pressure and radiation force distribution of dual-frequency ultrasound and to investigate its potential applications in areas such as acoustic levitation and ultrasonic cavitation through experiments.
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